Amid the crumbling Shogunate, seductive assassin Karyuu slips into a dimly lit estate, her big boobs straining against her stealthy attire as she eyes a target immersed in harem-like indulgences with his servants. Discovering him flirting with the maid, she prepares her strike, only for the woman to unveil as fellow shinobi Uzume who dispatches him with a sensual finality hinting at forbidden oral thrills. Horror shadows their ensuing duel as blades clash and bodies entwine in heated rivalry, marking the start of an intense rivalry in this hentai series.